Rihanna's friendship with Katy Perry is thought to be 'under strain' after reuniting with Chris Brown.

The female popstars have barely spoken to each other since the 'Rude Boy' singer and her ex-boyfriend patched things up, and Perry is said to believe she's 'making a huge mistake' by romancing Brown, according to the New York Daily News.

Advertisement - Continue Reading Below

Perry told MTV that since the pair have been dating, she's had little contact with the star.

She said: "We've had dinner, and that's about it. I didn't reach out to her after the incident."